A new record of Cedrela domatifolia W. Palacios is presented in Chanchamayo Valley, department of Junin, which adds to 11 the number of Cedrela (Meliaceae) species recorded in Peru. The most notorious vegetative character of the species are the prominent domatia in the axils of the secondary nerves of blades. At floral characters, the petals are red to fuchsia, an uncommon feature in the genus.

Augusto Weberbauer published, in 1922, the first vegetation map of Peru, where he showed and described twenty-five plant formations, grouped into six categories, considering altitudinal ranges defined according to their temperature. Within these categories are the microthermal formations that are generally found above 3400 masl and have a wide latitudinal distribution throughout the Peruvian Andes. To revalue that historical map, we present, firstly, the results of digitalization and estimation of extension of the four microthermal vegetation formations identified by Weberbauer, and secondly, the findings of cartographic contrasting between these microthermal formations, and the high Andean vegetation covers as classified in the most updated map on this subject. Weberbauer mapped an area of 183.445,30 km² for the four microthermal vegetation formations: typical high Andean formations (6...

Understanding the factors that determine the distribution of plant communities allows us to identify how climate and soil gradients influence the presence and abundance of species. In this paper, environmental parameters that determine species distribution along an altitudinal gradient were identified in the Chanchamayo valley. Using ordination and classification techniques, twelve 1 ha permanent plots were analyzed according to species affinities with climate and soil parameters. The results revealed three distinct plant communities, primarily governed by altitude (m), solar radiation (kJ m⁻² day⁻¹), and exchangeable acidity (Al³⁺H⁺, meq/100 g). This pattern confirms that, at more local scales, topographic and edaphic factors are determining factors in species assembly.

Un tema de interés actual en la ciencia forestal concierne a la regeneración de los bosques y áreas degradadas. Dentro de esta temática, un aspecto de importancia se refiere a los tiempos que diferentes forestas demoran en recomponerse de modo natural, recuperando sus niveles originales de diversidad y otras características que son claves para retomar su funcionamiento como ecosistemas. El presente trabajo se centra en el marco de los bosques húmedos premontanos de la selva central de Perú, en el valle de Chanchamayo, Junín, entre 1 000 - 1 500 msnm. Un total de 19 Transectos Gentry de 2 × 500 m, que incluyen todas las plantas leñosas ≥ 2.5 cm de Diámetro a la Altura del Pecho fueron establecidos en áreas de bosques maduros, y bosques de diferentes edades posteriores a talado sin quema. Se consideró 5 edades del bosque, 5 - 10, 20, 30, 40 y ≥ 50 años. Se comparó y anal...